PhD Thesis.In series: Linköping Studies in Science and Technology. Dissertations #946. Linköping University Electronic Press. 139 pages. ISBN:91-85297-98-4.Note: This work has been supported by University of Kalmar and the Knowledge Foundation.

Licentiate Thesis.In series: Linköping Studies in Science and Technology. Thesis #938. Institutionen för datavetenskap. 108 pages. ISBN:91-7373-313-X.Note: Report code: LiU-Tek-Lic-2002:11. The format of the electronic version of this thesis differs slightly from the printed one: this is due mainly to font compatibility. The figures and body of the thesis are remaining unchanged.